Question 133586
ISOSCELESE TRIANGLES HAVE 2 EQUAL SIDES.
BASE=X/4 WHERE X=LENGTH OF THE EQUAL SIDES.
2*X+X/4=90
2X+X/4=90
(4*2X+X)/4=90
(8X+X)/4=90
9X=360
X=360/9
X=40 ANSWER FOR THE LENGTH OF THE EQUAL SIDES.
BASE=40/4=10 LENGTH OF THE BASE.
PROOF
2*40+10=90
80+10=90
90=90