Sally has only 10-pence and 50 pence coins in her purse. She has 21 coins altogether with a total value of $5.30. Calculate how
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From the figure we notice that the triangle is an isosceles one. This means that the angles RTS and RST are the same. Hence:
To find the remaining angle we need to use the fact that the sum of the interior angles of any triangle is 180, then:
Plugging the values we know and solving for TRS we have:
Therefore, the angle TRS is 38°.