Question

hi there,
the chapter is heron's formula, and the question is no. 8 (attached below).
thank you for helping!

Answer 1

Hint: Find the area of each tile and then multiply it with no of tiles to get area of floral design. Finally multiply the area of floral design with the cost per cm^2 to get the answer.

Answer 2

Answer:

Rs.705

Step-by-step explanation:

it can be observed that

semi semi-perimeter of each triangle-shaped title,

s=(a+b+c)/2

=(35+28+9)/2

s=36

Area=

$= \sqrt{s(s - a)(s - b)(s - c)} \\ = \sqrt{36(36 - 35)(36 - 28)(36 - 9)} \\ = \sqrt{36(1)(8)(27)} \\ = 36 \sqrt{6} \\ = (36 \times 2.45) {cm}^{2} \\ = 88.2 {cm}^{2} \\ \\ area \: of \: 16 \: tiles = (16 \times 88.2) {cm}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 1411.2 {cm}^{2} \\ cost \: for \: polishing \: per \: {cm}^{2} = 50piase \\ total \: cost = rs.(1411.2 \times 0.50) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = rs.705.60$