A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 34° - 50° = 96°

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

b² + 2b - 8 = 0
(b - 2)(b + 4) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b - 2) or (b + 4) must equal zero:

If (b - 2) = 0, b must equal 2
If (b + 4) = 0, b must equal -4

So the solution is that b = 2 or -4

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.