Which expression can be used to find the area of triangle RST?

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (5 + 6 + 8)

(8 ∙ 4) - (5 - 6 - 8)

Question

Mathematics

Kaelyn Mcintosh

1 May, 17:52

Which expression can be used to find the area of triangle RST?

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (5 + 6 + 8)

(8 ∙ 4) - (5 - 6 - 8)

+5

Answers (2)

Know the Answer?

Darion Archer · Answer 1

(8 ∙ 4) - 1/2 (10 + 12 + 16) or A is the answer.

Giuliana · Answer 2

We start by drawing a rectangle around the triangle as shown in the diagram below Area of RST = Area of rectangle - (area of triangle A + area of triangle B + area of triangle C) Area of RST = (8*4) - [ (1/2*8*2) + (1/2*4*3) + (1/2*5*2) ] ⇒ we factorise the 1/2 out of the expression for the area of triangle A, B, and C Area of RST = (8*4) - 1/2 (16+12+10)

Which expression can be used to find the area of triangle RST?(8 ∙ 4) - (10 + 12 + 16)(8 ∙ 4) - (10 + 12 + 16)(8 ∙ 4) - (5 + 6 + 8)(8 ∙ 4) - (5 - 6 - 8)

Which expression can be used to find the area of triangle RST?

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (10 + 12 + 16)

(8 ∙ 4) - (5 + 6 + 8)

(8 ∙ 4) - (5 - 6 - 8)