Question

answer pls i’ll give a lot of points!!

Answer 1

Answer:

3) Area of sector is $28.143 \ cm^2.$

4) The length of arc of semicircle is 22 cm.

Step-by-step explanation:

Question 3.

Given

angle subtended by arc Φ = 129°

radius = 5 cm

We need to find the  Area of the sector.

Solution:

Area of the sector is equal to Angle divided by 360 multiplied by π multiplied by square of the radius

framing in equation form we get;

Area of the sector = $\frac{129}{360}\times 5^2 \times \pi = 28.143 \ cm^2$

Hence Area of sector is $28.143 \ cm^2.$

Question 4.

Given:

radius = 7 cm

angle subtended by arc Φ = 180°

We need to find the arc length of the semicircle.

Solution,

Length of arc is equal to Angle divided by 360 multiplied by 2 times π multiplied by radius.

framing in equation form we get;

Length of arc = $\frac{180}{360}\times2\times \pi\times7=22 \ cm$

Hence The length of arc of semicircle is 22 cm.