Question

What is the formula for the perimeter and area of: a triangle, a rectangle, a trapezoid, a circle?

Accepted Answer

**Triangle:**   *P* = add all sides; *A* = $$\frac{1}{2} \cdot base \cdot height$$   
    
**Rectangle:**   *P* = $$2 \cdot base + 2 \cdot height$$;    *A* = $$base \cdot height$$    

**Trapezoid:**   *P* = add all sides;    *A* = $$\frac{1}{2} \cdot (base_1+ base_2) \cdot height$$   
    
**Circle:**   *P* = $$2 \cdot π \cdot radius$$;    *A* = $$π \cdot radius^2$$

Flashcard 10 - Math Flashcard Set for the ACT

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