Question

An isosceles triangle’s altitude will bisect its base. Which expression could be used to find the area of the isosceles triangle above?

Answer 1

Answer:

The correct answer to this question is as follows; "First subtract the endpoints and then divide by 2"

Answer 2

The Correct Answer is (E) — Recall that congruent means that two polygons are the same shape and size. Since ∆ABC and ∆ACD are congruent, you know that each angle from one triangle corresponds to an angle of the other triangle. If you are having a hard time visualizing the triangles matching up, mark up the given diagram or draw your own to show the triangles side by side:

Just by filling in the angles, you can see that the remaining angle in each triangle must be 60°. To find ∠BCD, simply sum ∠BCA and ∠ACD to get a total of 60° + 90° = 150°.