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erik [133]
3 years ago
10

Find area of triangle ​

Mathematics
1 answer:
ivanzaharov [21]3 years ago
7 0

Answer:

49.1 cm² (round to nearest 10)

Step-by-step explanation:

- use trigonometry to find the <em>h</em><em>e</em><em>i</em><em>g</em><em>h</em><em>t</em><em>(</em><em>h</em><em>)</em><em> </em>of the triangle

- substitute height and base(b) 12cm into the formula

<em>A</em><em> </em><em>=</em><em> </em><em>½</em><em> </em><em>×</em><em> </em><em>b</em><em> </em><em>×</em><em> </em><em>h</em><em> </em><em>.</em>

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Let t represents number of years after 1900

so that means for 1900, value of t is 0

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and it says that life expectancy increases by 0.2

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now we use point (0,55)

55 =0.2(0) +b

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We are given y=73

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y=0.2t +55

73 =0.2t +55

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so t=90

This means the birth year =1900+t =1900+90 =1990


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