每日一题

Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

What is the area of the triangle in the figure above?


(A) 4.0
(B) 7.5
(C) 8.0
(D) 8.5
(E) 15.0

答案和解析

答案：B

解析：

The triangle in the figure is a right triangle with the right angle at the lower left.

Because it is a right triangle, its base and height are the two sides that form the right angle.

The area of a triangle is (1/2)*b*h.

The base of the triangle extends from point (0，0) to point (5，0). So it is 5 units long.

The height of the triangle extends from point (0，0) to point (0，3). So it is 3 units long.

Area = (1/2)*b*h

=(1/2)*3*5

=(1/2)*15

=7.5