Two-Dimensional Area Formulas

Area of a circle.

• A=πr²

• A=2πr

Give the most precise name of the figure and the correct formula(s) to find the area.

• Trapezoid

• Rhombus

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What is the area formula for a triangle?

• A = lw

• A = 1/2bh

• A = 1/2h(b₁+b₂)

• A = s²

Find the area of the square.

• 25 units²

• 10 units²

• 100 units²

• 20 units²

What is the area formula for a circle?

What is the area formula for a trapezoid?

• A = lw

• A = 1/2bh

• A = 1/2h(b₁+b₂)

• A = 1/2d₁d₂

Find the area of the triangle.

• A = 40cm²

• A = 20cm²

• A = 13cm²

• A = 80cm²

Find the area of the circle. Use 3.14 for pi.

Select the expression to calculate the area of this trapezoid.

What is the area formula for a PARALLELOGRAM?

• A= bh

• A= s²

• A= ¹/₂ b h

• A= ¹/₂ (b1 + b2) h