How do i solve both those questions?

See below

Step-by-step explanation:

9. Length of arc of circle, given central angle of measure n (in radians):

which simplifies to

For n = pi/4:

s = pi/4 * 5 = 1.25 pi = 3.92...

For n = pi/2:

s = pi/2 * 5 = 2.5 pi = 7.85...

Integer values between 3.92 and 7.85 are 4, 5, 6, and 7.

Pick one of them.

10. The square you drew will help.

The area of the shaded region is the area of the square minus the area of the 4 quarter circles inside the square. Four quarter circles amount to a full circle.

The square has side 8 which is the same as twice the radius of a circle.

shaded area = area of square - area of circle

shaded area = s^2 - pi r^2

shaded area = 8^2 - pi * 4^2

shaded area = 64 - 16pi

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc