- Adjacent Angles - angles that share a common side and that have a common vertex - Complementary Angles - angles which add together to make 90^{o} - Supplementary Angles - angles that add together to make 180° - Opposite Angles - when two lines intersect they create two pairs of opposite angles. Opposite angles are equal. - Acute Angles - angles that are less than 90^{o} - Right Angles - angles that are equal to 90^{o} - Obtuse Angles - angles that are more than 90^{o} but less than 180^{o} Question 1: The value of the BMC angle in the figure below is: 15^{o} 30^{o} 40^{o} 45^{o} Question 2: If AC and BD are the diagonals of rectangle ABCD and triangle EAB is equilateral, what is the value of angle ADE? 40^{o} 30^{o} 25^{o} 20^{o} Question 3: In the figure below, ∡AMB = 100^{o}, ∡BMD = 40^{o} and ∡CME = 60^{o}. What is the value of ∡CMD? 40^{o} 30^{o} 25^{o} 20^{o} Question 4: Calculate the sum of the angles a and b in the figure below: 160^{o} 200^{o} 240^{o} 260^{o} Question 5: Given two parallel lines a and b, what is the value of angle α in the figure below? 105^{o} 135^{o} 145^{o} 150^{o} Question 6: What is the supplement of a 36^{o} angle? 54^{o} 90^{o} 136^{o} 144^{o} Question 7: What is the complement of a 79^{o} angle? 11^{o} 21^{o} 101^{o} 97^{o} Question 8: What is the sum of the interior angles of the geometric figure below? 180^{o} 360^{o} 540^{o} 720^{o} Press the Submit button to see the results.