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x = y = ABCD is a rhombus ∘ ∘ D h = k = x y A ∘ 120∘ ∘ m = ∡D = m ∘ ∘ C h k B x = y = ABCD is a rhombus D 6 h = A x h C y B x = y = ABCD is a rhombus ∘ ∘ D k = h = x y ∘ A ∘ m = r = 55∘ q m ∘ p ∘ r A = s = s C ∘ h ∘ k p = q = B ∘ ∘ y = m = x = ABCD is a rectangle ∘ x A C m n q = p = n = y 8 ∘ ∘ ∘ p q 5 D B y = x = ABCD is a rectangle 4 A C p = q = 5 x q 10 M z = z y p D B y = m = x = ABCD is a rectangle ∘ ∘ ∘ A C 50∘ p = q = k = m k z ∘ ∘ ∘ M x z = y h = n = h n ∘ ∘ p ∘ q D B ABCD is a square C B y z a x g f h j e b c d D A a = b = c = d = e = f = g = h = j = y = z = x = |