A.A 10° angle is congruent to a 10° angle.B.Congruent angles always add up to 90°.C.A congruent angle is always 90°.
The total sum of angles of a triangle is 180, so only one angle of a triangle can be 90 ( making it a right angled triangle).However the sum of two angles of a triangle can be equal to 90, once again making it a right angled triangle.it is possible that two angle can be equal to 180-The acute angles of a right triangle are complementary.SUPPOSE ABC IS A TRIANGLE, where C = 90, thenA+B+90 = 180,A+B = 180-90or A+B = 90,or A = 90-Bso it's possible.
i was at the shops about a month ago and i saw a pre owned halo reachfor around $110 it would probly be close to $90or more right now but i dont know how if its being orderd coz you might have to payextra for postage and handeling =L