A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.

The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:

c = πd
c = π(2 * r)
c = π(2 * 17)
c = 34π

You need to find the value of b so solve the first equation in terms of x:

9b + x = 9
x = 9 - 9b

then substitute the result (9 - 9b) into the second equation:

9b - 4(9 - 9b) = 4
9b + (-4 x 9) + (-4 x -9b) = 4
9b - 36 + 36b = 4
9b + 36b = 4 + 36
45b = 40
b = \( \frac{40}{45} \)
b = \(\frac{8}{9}\)

The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 33° - 41° = 106°