6
A rectangular plywood measures 2.1 m by 70 cm. Circular discs are to be cut out
from the plywood of diameter 14 cm. How many discs can be cut and how much
plywood will be left?
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6
A rectangular plywood measures 2.1 m by 70 cm. Circular discs are to be cut out
from the plywood of diameter 14 cm. How many discs can be cut and how much
plywood will be left?
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Answer:
discs can be cut = 95
leftover plywood = 70 cm^2
Step-by-step explanation:
area of rectangle = l x b
l = 2.1 m x 10= 210 cm
b = 70 cm
= 210 x 70
= 14700 cm^2
area of circular disc = r^2
= 22/7 x 7 x 7 ( r=d/2=14/2 = 7cm)
= 22 x 7
= 154cm^2
no. of discs = ar. of rectangle/ ar. of circle
= 14700/ 154
= 95
therefore, 95 discs can be cut
area of 95 discs = 154 x 95 = 14630 cm^2
area of leftover plywood = 14700 - 14630 = 70 cm^2
therefore, 70 cm^2 of plywood will be left.