Calculate the missing measurement
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Step-by-step explanation:
2 ( l + 15 ) = 100
l + 15 = 50
l = 50 - 15
l = 35 cm
l x b = area
35 x 15 = 525 cm^2
2( 42 + b ) = 120
42 + b = 60
b = 60 - 42
b = 18 cm
l x b = area
42 x 18 = 756
1200 = 40 x b
b = 30 cm
perimeter = 2( l + b )
2( 40 + 30 )
2 ( 70 )
140 cm
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