Question

How do you find the measurement of 2d shapes?

Answer 1

Rectangle

a, b - sides.

A, B, C, D - angles

$\angle A= \angle B=\angle C = \angle D = 90 ^\degree$

area $S = a * b$

perimeter P = 2 (a + b)

Parallelogram

a, b - sides.

A, B, C, D - angles

$\angle A= \angle C$ $\angle B = \angle D$

area $S = b * h$

perimeter $P = 2 (a + b)$

Trapezoid

a, b, c, d - sides

A, B, C, D - angles

area $S= \frac{b+c}{2}h$

perimeter $P = a + b + c + d$

Triangle

a, b, c - sides

A, B, C- angles

area $S=\frac{1}{2}ch$

perimeter $P=a+b+c$

Ellipse

area $S=\pi ab$

perimeter $P=\pi \frac{a+b}{2}$