3. Find the total surface area of a chalk box of dimensions 15 cm, 12 cm and 10cm
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900cm^2
Step-by-step explanation:
l=15cm
b=12cm
h=10cm
TSA of chalk box = 2(lb+bh+hl)
= 2(15×12 + 12×10 + 10×15)
= 2(180 + 120 + 150)
= 2(450)
= 900cm^2
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