1. Geometry Item 09-05 In the figure, and is 10 units long. What is the area, in square inches, of ABC ? A. 25 B. 50 C. D. Cannot be determined www.upcatreview.com
2. Geometry Item 09-05 The area of a triangle is given by any of the formulas below: 1) A = ½(b)(h) where b is the base and h is the height or altitude of the triangle. www.upcatreview.com
3. Geometry Item 09-05 The area of a triangle is given by any of the formulas below: 2) A = - - - where s is the semi-perimeter, a , b , and c are the sides of the triangle. This is Heron’s Formula . The semi-perimeter of the triangle is computed as s = www.upcatreview.com
4. Geometry Item 09-05 The area of a triangle is given by any of the formulas below: 3) A = where s is the side of an equilateral triangle. This formula is applicable only to equilateral triangles. www.upcatreview.com
5. Geometry Item 09-05 In the figure, the base is given ( BC = 10) but the height ( AD ) is unknown. So Formula #1 cannot be used. Only one side ( BC ) of the triangle is given, so Formula #2 cannot be used. www.upcatreview.com
6. Geometry Item 09-05 The triangle is just an isosceles triangle ( ) and not enough information can tell whether the triangle is equilateral or not. So neither Formula #3 can be used. The answer is Choice letter D . www.upcatreview.com
