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Rectangles

Rectangles. Section 3-4-4. 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

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Rectangles

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  1. Rectangles Section 3-4-4

  2. 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.

  3. Perimeter 24 in 48 in • 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.

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

  5. 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

  6. 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

  7. Use Perimeter to find width • Solve.

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

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