1) The ratio of three angles of a triangle area 3:4:5. Find the angles.
2) In an isoceles triangle, the vertex angle is one-half each base angle. Find the angles of the triangle.
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1 Total of angles in a triangle is 180 degrees.
Now 3 + 4 + 5 = 12, so the angles are 3/12 x 180, 4/12 x 180 and 5/12 x 180.
You should be able to work it out from there.
2. Translating into algebra:
2a + b = 180
a = 2b
take it from there.
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