What is the perimeter of the triangle?

Step-by-step explanation:

6x + 7x + 4x + 2 + 4 - 5

17x + 1

diagram of truss with some angles missing

What are the measures of the angles located at positions a, b, & c? Note: the figure is symmetrical on the vertical through angle b.

The large triangle is an isosceles triangle. The two angles on the base are equal.Angle a = 35°

We now know two angles in the largest triangle. The third angle, angle b must add to these to make 180°.  

35° + 35° + b = 180°

b = 180° - 70°

b = 110°

We now know two angles in a quadrilateral. The two unknown angles, including angle c are equal. All four angles add up to 360°.  

2c + 110° + 120° = 360°

2c = 360° - 230°

2c = 130°

c = 65°

Step-by-step explanation: