The fastest way to draw a triangle

Open Adobe Illustrator and select the Polygon tool from the left toolbar. It looks like a star icon and sits in the same group as the rectangle and circle tools — click and hold on the rectangle tool to see the dropdown menu. Click the Polygon tool once to select it.

Before you draw, look at the top toolbar. You'll see a field that says "Sides" with a number next to it. Change that number to 3. This tells Illustrator to make a three-sided shape instead of the default five or six sides.

Now click and drag on your canvas to create the triangle. Hold down Shift while you drag to make the sides equal length — this gives you a regular triangle instead of a lopsided one. Release the mouse when the triangle is the size you want.

Key Takeaways

  • The Polygon tool creates triangles and other multi-sided shapes; find it by clicking and holding the rectangle tool in the left toolbar.
  • Change the "Sides" field in the top toolbar to 3 before you draw, or your shape will have more than three sides.
  • Hold Shift while dragging to create a triangle with equal sides and angles instead of an irregular shape.
  • You can rotate, resize, and change the color of your triangle after you draw it using the selection tool and the color panel.

Adjusting the triangle after you draw it

Once the triangle is on your canvas, you can move it, resize it, or change its color. Make sure the selection tool (the arrow at the top of the left toolbar) is active, then click the triangle to select it.

To move the triangle, click and drag it to a new location. To resize it, grab one of the corner handles and drag outward to make it larger or inward to make it smaller. Hold Shift while resizing to keep the proportions the same.

To change the color, look at the bottom of the left toolbar where you see two overlapping squares — one is the fill color (inside) and one is the stroke color (outline). Click the fill square to open the color picker and choose a new color for the inside of the triangle. Click the stroke square to change the outline color.

Rotating your triangle

If you need the triangle to point in a different direction, use the rotation tool. With the triangle selected, press R on your keyboard to switch to the rotation tool, or find it in the left toolbar (it looks like a curved arrow).

Click the triangle once more to show the rotation handles — you'll see a circle with crosshairs in the center and small squares around the edges. Click and drag any of the corner squares to rotate the triangle. The center point (the crosshairs) is the pivot point, so the triangle will spin around that spot.

If you need to rotate the triangle to an exact angle, you can type the number directly. After you click the triangle with the rotation tool active, look at the top toolbar for an angle field. Type the number of degrees you want to rotate and press Enter.

Creating different triangle styles

The Polygon tool always creates a regular triangle with equal sides and angles. If you want a right triangle or an isosceles triangle with different proportions, you'll need to adjust it after drawing.

One way is to use the Direct Selection tool (the white arrow in the left toolbar, below the black selection arrow). Click the triangle with this tool to show the three corner points. Click and drag any corner point to reshape the triangle however you want. This lets you create triangles that aren't regular.

Another approach is to draw a rectangle, then use the Pen tool to click three points and create a triangle from scratch. This takes longer but gives you complete control over where each corner sits.

Duplicating and arranging triangles

If you need multiple triangles, the fastest way is to duplicate the one you already made. Select the triangle with the selection tool, then press Ctrl+D on Windows or Cmd+D on Mac. Illustrator creates an exact copy directly on top of the original. Drag the copy to a new location.

You can repeat this as many times as you need. Each copy will have the same size, color, and rotation as the original, so you only have to format once.

To arrange multiple triangles, use the Arrange menu. Select one triangle, then go to Object > Arrange and choose whether you want it to move forward or backward in the stack. This controls which shapes appear on top when they overlap.

Saving and exporting your triangle

When you're done, save your work as an Illustrator file so you can edit it later. Go to File > Save and choose a location and filename. Illustrator will save it as a .ai file.

If you need to use the triangle in another program — like Photoshop, InDesign, or on the web — you'll need to export it. Go to File > Export As, choose your format (PDF, PNG, SVG, or JPG are common), and click Export. Each format has different uses: PNG and SVG work well for web graphics, PDF preserves the vector quality if you're sending it to print, and JPG compresses the file if you just need a smaller image.

Frequently Asked Questions

Why does my triangle have more than three sides?

The Polygon tool defaults to five or six sides. Before you draw, check the "Sides" field in the top toolbar and change it to 3. If you already drew the shape, delete it and try again with the correct number set.

How do I make a triangle with a specific width and height?

Draw the triangle roughly, then select it and look at the top toolbar. You'll see width and height fields showing the current dimensions in pixels or inches. Type the exact measurements you want and press Enter. The triangle will resize to match.

Can I make a triangle with a gradient fill instead of a solid color?

Yes. Select the triangle, then open the Gradient panel (Window > Gradient). Click the gradient preview to choose a preset, or drag the color stops to create your own gradient. The triangle will fill with the gradient colors you select.

What's the difference between the selection tool and the direct selection tool?

The selection tool (black arrow) moves and resizes the whole triangle as one object. The direct selection tool (white arrow) lets you click individual corner points and move them separately, which reshapes the triangle. Use the selection tool for most tasks and the direct selection tool only when you need to edit specific corners.

How do I make the triangle outline thicker?

Select the triangle, then look at the Stroke panel (Window > Stroke). You'll see a "Weight" field showing the current outline thickness. Increase that number to make the outline thicker. You can also change the stroke color here if you want a different outline color than the fill.