What is the missing reason in step 5?
given: circle with diameter ln and inscribed angle
lmn
prove: zumn is a right angle.
statements
reasons
1. circle o has diameter ln and 1. given
inscribed angle lmn
lkn is a semicircle
2. diameter o divides
into 2 semicircles
3. circle o measures 360° 3. measure of a circle
is 360°
4. m lkn = 180°
4. definition of semicircle
5. m lmn = 90°
6. zlmn is a right angle
15.1?
6. definition of right angle
ohl theorem
o inscribed angle theorem
o diagonals of a rhombus are perpendicular.