Circle areas

Question

0

495

4

+88

I have attempted these two questions and gotten the answers, in decmial, which are: 25.13, and 57.95 respectively. Are they correct?

grs75 May 3, 2021

edited by grs75 May 3, 2021

catmg · Answer 1 · 2021-05-03T04:52:54

5.

12, 12 angle of 20.

To find the other one, law of cosines.

x^2 = 12^2+12^2 - 2*12*12*cos(20 degrees)

x^2 = 17.3685252137

x = 4.16755626401

Oh no, it looks like we got different answers. :((

=^._.^=

civonamzuk · Answer 2 · 2021-05-03T09:38:39

5) R = 12 ∠θ = 120º (NOT 20 )

Chord C = 2[ sqrt(12² - 6²)]

But..., if ∠θ = 20º then the answer is "slightly" different:

C = 2[sin(10º) * 12] ==> 24 sin(10º)