Triangles and Parallelograms: Area & Perimeter

Units for Area

• m²

• cm²

• km

• inches

Base of a Triangle

• side of a triangle

• angle of a triangle

• vertex of a triangle

• height of a triangle

Equilateral Triangle Perimeter

• @@P = 3 \times \text{side}@@

• @@P = 2 \times \text{side}@@

• @@P = 3 \times \text{base}@@

• @@P = \text{side}^2@@

Rectangle vs Parallelogram Area

• @@A = ext{base} imes ext{height}@@

• @@A = ext{length} imes ext{width}@@

• @@A = rac{1}{2} imes ext{base} imes ext{height}@@

• @@A = ext{base} + ext{height}@@

Parallelogram Perimeter Formula

• @@P = 2 imes ( ext{base} + ext{side})@@

• @@P = ext{base} + ext{side}@@

• @@P = 2 imes ext{base}@@

• @@P = 4 imes ext{side}@@

Height of a Parallelogram

• distance from base to opposite side

• length of the base

• perimeter of the parallelogram

• area of the parallelogram

Triangle Perimeter Formula

• @@P = a + b + c@@

• @@P = 2(a + b)@@

• @@P = a^2 + b^2 + c^2@@

• @@P = rac{1}{2}ab@@

Base of a Parallelogram

• side of the parallelogram

• angle of the parallelogram

• diagonal of the parallelogram

• height of the parallelogram

Parallelogram Area Formula

• @@A = ext{base} imes ext{height}@@

• @@A = ext{length} imes ext{width}@@

• @@A = rac{1}{2} imes ext{base} imes ext{height}@@

• @@A = ext{base} + ext{height}@@

Triangle Area Formula

• @@A = rac{1}{2} imes ext{base} imes ext{height}@@

• @@A = ext{base} imes ext{height}@@

• @@A = rac{1}{3} imes ext{base} imes ext{height}@@

• @@A = rac{1}{2} imes ( ext{base} + ext{height})@@