Geometry Chapter 1 section 3 Using Formulas. Area Area is measured in square units An in 2 is a square 1 inch on a side.

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Presentation transcript:

Geometry Chapter 1 section 3 Using Formulas

Area Area is measured in square units An in 2 is a square 1 inch on a side

Area formulas Rectangle l w where l is the length of the rectangle and w is the width of the rectangle 12 5 Area = 5(12) 60

Perimeter Perimeter is the distance around a figure Distance is measured in length units

Perimeter formulas Rectangle 2 l + 2 w where l is the length of the rectangle and w is the width of the rectangle 12 5 Perimeter = 2(5) + 2(12)

U - Try lw AreaPerimeter

Maximize the area given a perimeter Divide the perimeter by 2 Look at all the sets of 2 #’s that add up to this # Multiply those sets of #’s together till you find the biggest one

Given a perimeter of 20 ft. find the maximum area it can enclose 20 / 2 = 10 So l +w = 10 lw Area

Given a perimeter of 12 ft. find the maximum area it can enclose ___ / 2 = ___ So l +w = ___ lw Area U - Try

Do Now Page 22 – 24 Problems – 36, 43,