Question

please help me in doing this with explanation​

Answer 1

Step-by-step explanation:

surface area of cuboid -: 2(lb+bh+hl)

i) 2(9×4+4×3+3×9) = 2 × (36+12+27)

= 2× 75 = 150 cm ^2

ii) 2(5×5+5×10+10×5) = 2(25+50+50)

= 2×125 = 250 m^2

iii) 2(12×10+10×4+4×12) = 2(120+40+48)

= 2×208 = 416 cm^2

iv) 2(5×1.5+1.5×2.4+2.4×5) = 2(7.5+3.6+ 12)

= 2× 22.5 = 45 cm^2

v) 2(11/2×4+4×21/2+21/2×11/2)

=2(22+42+16)

= 2× 80 = 160 cm^2

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