考研英语几何基础答案如下：
1. What is the area of a rectangle with length 8 and width 5?
答案：The area of the rectangle is 40 square units.
2. If a triangle has sides of lengths 3, 4, and 5, what is its area?
答案：The area of the triangle is 6 square units.
3. What is the volume of a cylinder with a radius of 3 and a height of 5?
答案：The volume of the cylinder is 141.37 cubic units.
4. If a sphere has a radius of 2, what is its surface area?
答案：The surface area of the sphere is 50.27 square units.
5. What is the equation of a circle with center (3, 4) and radius 5?
答案：The equation of the circle is (x - 3)² + (y - 4)² = 25.
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