Answer: Since the lowest common multiple of 140 and x is 420: because 140 divides into 420 three times, x must contain a 3. Since x contains both 20 and 3 as factors, x is 20 · 3 = 60.
c + 70 = 180 (supplementary angles always add up to 180)
c = 180 - 70
c = 110
a = 35. (vertically opposite angles are equal)
b + 90 + 35 = 180 (angles in a triangle add up to 180)
b = 55
Answer:
length (l)=69 cm
breath(b)=45cm
area (a)= 10560 cm²
height (h)=?
now,
Area of cuboid =2(lb+bh+hl)
10560 cm²=2(60×45+45×h+60×h)
10560 cm²=