Question

please answer this question

Answer 1

this question is answered by the formulas of surface area

Answer 2

As the red and black triangular pieces of cloth are stitched alternatively, there are 3 pieces of each cloth..

We can find area by Heron's formula

S= Perimeter of Triangle ÷ 2

=》Perimeter= 20+50+50

=》120

S=60

Heron's formula= whole square root [s(s-a)(s-b)(s-c)]

=》whole square root[60(60-20)(60-50)(60-50)]

=》Whole square root[60(40)(10)(10)

=》Whole square root[2400×100]

=》200root6

For 3 triangles,

Area=3× area of 1 triangle

Area=3×200root6

Area=600root6

Therefore, we need 600root6 cm square of each color i.e. of red and black color respectively.

Hope it helps...

:)