In right triangle ABC, the right angle is at A, m∠B = 30°, m∠C = 60°, and the hypotenuse BC = 20. What is the area of △ABC?

Right triangles ABC and DEF each have a right angle at A and D respectively, with AB = DE = 12. It is also given...

In isosceles triangle ABC, AC ≅ BC, and CD is the altitude from C to base AB, with m∠ACD = 55°. Using triangle...

In the figure, DB is a shared side of triangles ADB and CDB. It is given that DA ≅ DC and AB ≅ CB. Which postulate...

A house-shaped figure (a rectangle topped by an isosceles triangle, with the triangle's apex directly above the...