Isosceles triangle with its height drawn, for area

An example figure from the Triangle Generator.

Isosceles triangle ABC with base AB labeled 10, equal sides CA and BC labeled 13 with one tick mark each, and a dashed height from C labeled h — An isosceles triangle ABC with base AB labeled 10 and its two equal sides, CA and BC, each labeled 13 and marked with a congruence tick. A dashed height runs from C down to the middle of AB, labeled h, with a right-angle square where it meets the base. Students find h, then the area.

Edit this figure Download PNG

Editing opens it in the Triangle Generator with these settings, to change anything and copy or download your own.

Answer key

∠A = 67.4°
∠B = 67.4°
∠C = 45.2°
Height from C to AB = 12
Area = 60

Free to use in your tests, worksheets, slides or anything else. Open source under Apache 2.0. How to reuse our figures

More Triangle examples

Make your own in the Triangle Generator →