Perimeter Problem #3 Posted on September 21, 2014 by solvemymaths r and q are circle centres. pr = 9 cm qr = 4 cm Find the length of the black line. Share this:TwitterFacebookLike this:Like Loading... Related

Checked again and got the same answer. Where do I go wrong? sqrt(4^2+5^2-2*4*5*cos50)+5+5+9+9sqrt2+2*9/tan20 Reply

your answer is correct. I have the same calculations as you, but must have f**ed it up pressing them into calculator! Reply

85.0925662 cm ?

I get 86.4 ish

Checked again and got the same answer. Where do I go wrong?

sqrt(4^2+5^2-2*4*5*cos50)+5+5+9+9sqrt2+2*9/tan20

it may be me! I’ll check in a bit.

your answer is correct. I have the same calculations as you, but must have f**ed it up pressing them into calculator!