The reason that is missing in step 2 is triangle angle sum theorem. </span>The triangle angle sum theorem states that t<span>he sum of the measures of the interior angles of a triangle is 180°.
</span>Question 2 <span>Given that △ABC is an isosceles triangle with legs AB and AC and △AYX is also an isosceles triangle with legs AY and AX.
To prove that △ABC ~ △AYX.
Statements Reasons
1. △ABC is isosceles with legs AB and AC;
△AYX is also isosceles with legs AY and AX. 1. given
2. AB ≅ AC and AY ≅ AX 2. definition of isosceles triangle
3. AB = AC and AY = AX 3. definition of congruency
4. AY • AC = AX • AC 4. multiplication property of equality
5. AY • AC = AX • AB 5. substitution property of equality
6. AY </span><span>• AC / AB = AX 6. division property of equality
7. AY/AB = AX/AC 7. division property of equality </span><span>8. ? 8. ?
9. △ABC ~ △AYX 9. SAS similarity theorem
The statement and reason missing in the proof are ∠A ≅ ∠A; reflexive property</span> <span>SAS Similarity or Side-Angle-Side similarity states that when two triangles have corresponding angles that are congruent and corresponding sides with identical ratios, then the triangles are similar.</span>
<span>Question 3 - Given that line RS intersects triangle BCD at two points and is parallel to segment DC.
The statements thet are correct is △BCD is similar to △BSR.</span>