answer me please
with explanation
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Answer:
y=18 cm
Step-by-step explanation:
In ΔACD,
(AD)²=(AC)²+(CD)²
(25)²=(AC)²+(7)²
625=(AC)²+49
(AC)²=625-49
(AC)²=576
AC=√576
AC=14 cm
In ΔABC,
(AB)²=(AC)²+(BC)²
(30)²=(14)²+(BC)²
900=576+(BC)²
(BC)²=900-576
(BC)²=324
BC=√324
BC=18 cm
y=18 cm
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