2 years ago

I need help with those 2

Mathematics

1 answer:

galina1969 [7]2 years ago

7 0

Question 7 is a, multiply ever number by 5
question 8 is also a, multiply every number by -2

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Step-by-step explanation:

a= 12 mm ; b = 16 mm ; c = 18 mm

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$=\dfrac{12 + 16 + 8}{2}\\\\= \dfrac{36}{2}\\\\= 18\\\\$

s -a = 18 - 12 = 6 mm

s -b = 18 - 16 = 2 mm

s -c = 18 - 8 = 10 mm

$area = \sqrt{s(s -a)(s-b)(s-c)}$

$= \sqrt{18*6*2*10}\\\\= \sqrt{2160 }\\\\=46.47\\\\=46 \ mm^{2}\\$

$\dfrac{1}{2}* \ base * \ height = 46\\\\\dfrac{1}{2}*16* \ height = 46\\\\height = \dfrac{46*2}{16}\\\\$

= 5.75

Height = 5.8 mm

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