Question

Can someone check my answers,, will medal ?

What is the volume of a sphere that has a 14 m diameter?

205 m3
808 m3
1077 m3
1436 m3< I got this one .

Answer 1

well the radius is 7 m

so the volume is

\[V= \frac{4}{3} \times \pi \times 7^3\]

Answer 2

your answer is good. well done

Answer 3

thank you okay ,, i got another one .

Answer 4

If MS = 25 m, MT = 15 m, and TR = 5 m, what is the value of IS?

8.33 m
6.25 m< I got this one.
4 m
3 m

Answer 5

well that looks good as well

Answer 6

. What is the measure of angle S?

12°
22° <I got this one
42°
44°

Answer 7

I would have said 42

Answer 8

okay ,, could you explain the steps and formula to me ?

Answer 9

oops you're right... 1/2 the difference in the arc measures...

Answer 10

Oh okay

What is the approximate measure of angle R?

17.75°
29°< I got this one
43.6°
46.4°

Answer 11

well its a bit more than 45... since the triangle is almost isosceles

Answer 12

I used the formula c^2 = a^2 + b^2 to get it .

c^2 = 20^2 + 21^2

c^2 = 400 + 441

C^2 = 841

c^2 = 841 sq.

c = 29

Answer 13

you can't use pythagoras' theorem to find an angle...

you can use the tan ratio