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| Math Central | Quandaries & Queries |
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Question from cristine, a student: the area of a rectangle is 675sq.cm. |
Hi Cristine,
If the length of a triangle is L cm and the width is W cm then the area is L × W sq cm. Use this to put your question in mathematical form.
- the area of a rectangle is 675sq.cm.
thus
L × W = 675 sq cm
- the width is 1/3 of the length
thus
W = 1/3 × L cm
Substitute the second equation into the first
L × 1/3 × L = 675 sq cm
or
1/3 L2 = 675 sq cm.
Solve for L.
Penny
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