17) Which of the following are not the sides of a right angled triangle?
(A) 3, 4, 5
(B) 1, √3, 2
(C) 1, 1, √2
(D) √3, √4, √5
18) What is the area of a square whose diagonal is 8?
(A) 16
(B) 64
(C) 32
(D) 24
19) In the figure below, what is the perimeter of ∆ABC
(A) 24
(B) 16
(C) 16+8√2
(D) 16+8√3
20) For the triangle below, which of the following relationship between and b is true
(A) b = 60 - a
(B) a = b
(C) a + b = 90
(D) a = 90 - 3b
21) If the difference between the two acute angles of a right angled triangle is 8°, what is the measure of the smallest angle?
(A) 37°
(B) 41°
(C) 42°
(D) 49°