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Find the exterior and interior angles x and y for the two triangles shown.

Mathematics

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2 parts
a

140∘\text{140}^\circ

40∘\text{40}^\circ

b

131∘\text{131}^\circ

49∘\text{49}^\circ

Step-by-step solution

4 steps

Here are the solutions for the given problems.

:

Part a· 2 steps

Find xx and yy for the top triangle.

  1. Find the value of yy.

    The sum of the interior angles in a triangle is 180∘180^\circ.

    60∘+80∘+y=180∘60^\circ + 80^\circ + y = 180^\circ 140∘+y=180∘140^\circ + y = 180^\circ y=180∘−140∘y = 180^\circ - 140^\circ y=40∘y = 40^\circ
  2. Find the value of xx.

    The angle xx is an exterior angle of the triangle. An exterior angle is equal to the sum of the two opposite interior angles.

    x=60∘+80∘x = 60^\circ + 80^\circ x=140∘x = 140^\circ

    Alternatively, xx and yy form a linear pair, so x+y=180∘x + y = 180^\circ.

    x+40∘=180∘x + 40^\circ = 180^\circ x=180∘−40∘x = 180^\circ - 40^\circ x=140∘x = 140^\circ

    The values are:
    x=140∘x = \boxed{\text{140}^\circ}
    y=40∘y = \boxed{\text{40}^\circ}

    :

Part b

131∘\text{131}^\circ

Find xx and yy for the bottom triangle.

  1. Find the value of yy.

    The square symbol indicates a right angle, which is 90∘90^\circ. The sum of the interior angles in a triangle is 180∘180^\circ.

    41∘+90∘+y=180∘41^\circ + 90^\circ + y = 180^\circ 131∘+y=180∘131^\circ + y = 180^\circ y=180∘−131∘y = 180^\circ - 131^\circ y=49∘y = 49^\circ
  2. Find the value of xx.

    The angle xx is an exterior angle of the triangle. An exterior angle is equal to the sum of the two opposite interior angles.

    x=41∘+90∘x = 41^\circ + 90^\circ x=131∘x = 131^\circ

    Alternatively, xx and yy form a linear pair, so x+y=180∘x + y = 180^\circ.

    x+49∘=180∘x + 49^\circ = 180^\circ x=180∘−49∘x = 180^\circ - 49^\circ x=131∘x = 131^\circ

    The values are:
    x=131∘x = \boxed{\text{131}^\circ}
    y=49∘y = \boxed{\text{49}^\circ}

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