If angle 1 plus angle 2 equals 90 degrees, angle 3 plus angle 2 equals 90 degrees, and angle 1 equals 40 degrees, then how many degrees does angle 3 equal and what is the basis

If angle 1 plus angle 2 equals 90 degrees, angle 3 plus angle 2 equals 90 degrees, and angle 1 equals 40 degrees, then how many degrees does angle 3 equal and what is the basis

Angle 1 equals angle 3 equals 40 degrees

How to prove that a triangle is a right triangle. The first one is Pythagorean theorem. The second one is that the sum of two angles equals 90 degrees. Is there the third one? I remember the teacher said that it seems to be a 30 degree angle or something. Who can tell me more about it

Right triangle. (a-5) square + | B-12 | + C square-26c + 169 = 0 (a-5) ^ 2 + | B-12 | + (C-13) ^ 2 = 0 because (a-5) ^ 2 is greater than or equal to 0, | B-12 | is greater than or equal to 0, and (C-13) ^ 2 is greater than or equal to 0, so they are all equal to zero, so a = 2, B = 12, C = 13 and a ^ 2 + B ^ 2 = C ^ 2 are straight angles

How much is angle 1 equal to angle 2 and angle 3 equal to

Corner 4

In a triangle, angle one plus angle two equals 110 degrees, angle two plus angle three equals 90 degrees, what is angle two

Angle one plus angle two is 110 degrees
Jiao 3 = 180-110 = 70
Angle two plus angle three is 90 degrees,
Angle 1 = 180-90 = 90 degree
Angle 2 = 180-70-90 = 20