Question

If breath, height, area of cuboid are 10, 15, 1300cm2 and find the length?

Answer 1

Answer:

l = 20cm

Step-by-step explanation:

b = 10cm

h = 15cm

TSA = 1300cm²

Let length = l

TSA = 2(lb+lh+bh)

2(lb + lh + bh) = 1300

2[ (l*10) + (l*15) + (10*15) ] = 1300

2( 10l + 15l + 150 ) = 1300

2(25l + 150) = 1300

25l + 150 = $\frac{1300}{2}$

25l + 150 = 650

25l = 650 - 150

25l = 500

∴ l =  $\frac{500}{25}$

    = 20cm