Plzz solve this I mark brainlist
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Step-by-step explanation:
p(Δ) = 10+18+c
42=28+a
a=14
s=42/2
s=21
a(Δ)=√s(s-a)(s-b)(s-c)
a(Δ)=√21(21-10)(21-18)(21-14)
a(Δ)=√21(11)(3)(7)
a(Δ)=√(3)(3)(7)(7)(11)
a(Δ)=(3)(7)√11
a(Δ)=21√11 m²
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