please help me solve this question
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Answer:
21√11 cm²
Step-by-step explanation:
प्रथम भुजा (a) = 18 cm
द्वितीय भुजा (b) = 10 cm
परिमाप (p) = 42 cm
आधा परिमाप (s) = 42/2 = 21 cm
तृतीय भुजा (c) = p - (a + b) = 42 - (18 + 10) = 14 cm
क्षेत्रफल = √[s (s - a) (s - b) (s - c)]
= √[21 (21 - 18) (21 - 10) (21 - 14)]
= √[21 (3) (11) (7)]
= √(21 × 21 × 11)
= 21√11 cm²
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