Answer:
i think its 12 :)
Step-by-step explanation:
20 + 48 = 68
180 - 68 = 112
20 + 48 + 112 = 18 (a full triangle!)
= 52 cm
C²= a²+ b²
C²= 48²+ 20²
C²= 2304 + 400
√C²= √2704
C = 52 cm
