Rectangles. Rectangles and Algebra To solve questions involving geometric shapes first draw a picture use formulas or common sense. A rectangle's perimeter.

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Presentation transcript:

Rectangles

Rectangles and Algebra To solve questions involving geometric shapes first draw a picture use formulas or common sense. A rectangle's perimeter is found by adding all the sides. Most of these questions can be solved using common sense These questions are also a good way to practice two step equations.

Perimeter My table is 24 in by 48 in. What is the area and perimeter? First draw and label a picture (rectangle). Second choose a formula. P=2l+2w Fill in the known values. P=2(48)+2(24) Simplify. P=96+48 Solve. P=144 in. 24 in 48 in

Area A=lw 48(24)=1152 sq. in.

Rectangles with Algebra Jan’s art teacher told her to make a frame with the length three times the width. The perimeter is 144 inches. What are the dimensions and area of the picture? w l=3w

Use perimeter to find width Perimeter First draw and label a picture (rectangle). Second choose a formula. P=2l+2w Fill in the known values. 144=2l+2w l=3w Simplify. 144=2(3w)+ 2w

Use Perimeter to find width Solve.

Now Find Area Area New Formula A=lw 54(18)=972 sq. in.