4.10. Isosceles Triangles http://www.ck12.org
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Find the measures ofxand/ory.
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Determine if the following statements are true or false.
- Base angles of an isosceles triangle are congruent.
- Base angles of an isosceles triangle are complementary.
- Base angles of an isosceles triangle can be equal to the vertex angle.
- Base angles of an isosceles triangle are acute.
Complete the proofs below.
10.Given: Isosceles 4 CIS, with base angles^6 Cand^6 SIOis the angle bisector of^6 CISProve:IOis the perpen-
dicular bisector ofCS