Cho hình chóp S. ABCD đáy ABCD là hình thang, AD=2BC. Gọi I là trung điểm AD, M là điểm thuộc SD. Xác định thiết diện của hình chóp cắt bởi mặt phẳng (MBI)

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.