What is the next step in the given proof? choose the most logical approach.

a.
statement: egc agd
reason: substitution property of equality

b.
statement: cgb agd
reason: vertical angles theorem

c.
statement: ega and egb are supplementary.
reason: linear pair theorem

d.
statement: agd and dgb are supplementary.
reason: linear pair theorem

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.