Answer:
Section 2
Step-by-step explanation:
I will pick the section with the largest angle.
Let's determine the size of the angle of each section.
Given:
mâ ABD = 2x+3,
mâ CBD = 4x+7,
mâ ABC = 40°
Thus:
m<ABD + m<CBD = m<ABC (angle addition postulate)
Substitute
2x + 3 + 4x + 7 = 40
Add like terms
6x + 10 = 40
6x + 10 - 10 = 40 - 10
6x = 30
6x/6 = 30/6
x = 5
âď¸mâ ABD = 2x+3
Plug in the value of x
m<ABD = 2(5) + 3 = 13° (section 1)
âď¸mâ CBD = 4x+7
mâ CBD = 4(5) + 7
mâ CBD = 27° (section 2)
â
I will pick section 2 because it is the section with the largest angle, which means it is the biggest.