Perimeters and Areas

Formula for area of a square

• $l\times l$

• $4l$

• $l+l$

• Sum of all sides

Formula for circumference of a circle

• $\pi r^{2\ }$

• $2+\pi+r$

• $2\pi r$

• $O+r$

Perimeter of parallelogram

• $2\left(a+b\right)$

• $b+h$

• $a+b+h$

• $b\times h$

Formula for area of rectangle

• $\pi r^2$

• $\frac{1}{2}\times b\times l$

• $2\left(l+b\right)$

• $l\times b$

Formula to find perimeter of a trapezium

• $a+b+c+d+h$

• $\frac{1}{2}\times\left(a+b\right)\times h$

• $a+b+c+d$

• $2\left(a+b\right)$

Perimeter of a triangle

• $a+b+c$

• $a+b+c+h$

• $\frac{1}{2}\left(a+b+c\right)$

• $\frac{1}{2}+b+h$

Formula for area of a circle

• $\pi d$

• $Or^2$

• $2\pi r$

• $\pi r^2$

Area of a parallelogram

• $2\left(ab\right)$

• $2\left(a+b\right)$

• $b\times h$

• $b+h$

Formula to find area of a trapezium

• $\frac{1}{2}\times\left(a+b\right)\times h$

• $\frac{1}{2}\times\left(a+b+c\right)\times h$

• $b\times h$

• $\frac{1}{2\ }\times a\times b\times h$

Formula for the perimeter of a rectangle

• $\frac{1}{2}\times\left(a+b\right)\times h$

• $2\left(l+b\right)$

• $4\times l$

• $4l$