ACT Math Formulas

What is the formula for area of a circle?

• $\pi d$

• $2\pi r$

• $\pi r^2$

• $\frac{4}{3}\pi r^3$

Tags

CCSS.7.G.B.4

What is the formula for circumference of a circle?

•  $2\pi d$  

• $2\pi r$

• $\pi r^2$

• $\frac{4}{3}\pi r^3$

Tags

CCSS.7.G.B.4

What is the formula for area of a trapezoid?

• $\frac{1}{2}h\left(b_1+b_2\right)$

• $bh$

• $\frac{1}{2}bh$

• $2h\left(b_1+b_2\right)$

Tags

CCSS.6.G.A.1

What is the formula for area of a sector of a circle?

• $\pi r^2$

• $\frac{\theta}{360}\pi r^2$

• $\frac{\theta}{360}\pi d$

• $4\pi r^3$

Tags

CCSS.HSG.C.B.5

What is the formula for arc length?

• $\pi r^2$

• $\frac{\theta}{360}\pi r^2$

• $\frac{\theta}{360}\pi d$

• $4\pi r^3$

Tags

CCSS.HSG.C.B.5

What is the formula for area of a parallelogram?

•  $bh$  

•  $\frac{1}{2}bh$  

•  $lw$  

•  $\pi r^2$  

Tags

CCSS.6.G.A.1

What is the equation of a circle?

• $A=\pi r^2$
  

• $y-y_1=m\left(x-x_1\right)$

• $r^2=\left(x-h\right)^2+\left(y-k\right)^2$

• $a^2+b^2=c^2$

Tags

CCSS.HSG.GPE.A.1

What is the slope-intercept form of the equation of a line?

• $y=mx+b$

• $y-y_1=m\left(x-x_1\right)$

• $r^2=\left(x-h\right)^2+\left(y-k\right)^2$

• $a^2+b^2=c^2$

Tags

CCSS.8.F.A.3

CCSS.8.EE.B.6

What is the point-slope form of the equation of a line?

• $y=mx+b$

• $y-y_1=m\left(x-x_1\right)$

• $r^2=\left(x-h\right)^2+\left(y-k\right)^2$

• $a^2+b^2=c^2$

Tags

CCSS.HSG.GPE.B.5

What is the formula for the area of a rectangle?

• $lw$

• $\frac{1}{2}bh$

• $\pi r^2$

• $2h\left(b_1+b_2\right)$

Tags

CCSS.4.MD.A.3

CCSS.3.MD.C.7B