9th grade pls help ty

Question

asked Oct 21, 2024 87.2k views

1 Answer

Dimitry Ernot · Answer 1 · 2024-10-25T19:54:10+0000

Answer:

A) 126π mm²

Explanation:

The central angle theorem of circle:

The central angle subtended by two points on a circle is twice the inscribed angle subtended by those points.

∠BAC = 2 *70°

= 140°

$\theta = 140^\circ$

r = 18 mm

$area \ of \ Sector \ BAC = (\theta)/(360)*\pi r^2$

$\sf =(140)/(360)*\pi *18*18\\\\ = 126\pi \ mm^2$