Which pair of triangles must be similar?

a.) triangles 1 and 2 they each have a 40 degree angle.
b.) triangle 7 has a 40 degree angle and a 35 degree angle. triangle 8 has a 40 degree angle and a 105 degree angle.
c.) triangle 5 has a 25 degree angle and a 75 degree angle. triangle 6 has a 25 degree angle and a 70 degree angle.

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.