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 2 years ago
In the figure at right, it is given than BDC is straight, BD = DA, and AB = AC = DC. Find the size of angle C
 2 years ago
In the figure at right, it is given than BDC is straight, BD = DA, and AB = AC = DC. Find the size of angle C

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asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.1do you know what an isosceles triangle is and what its properties are?

Copythat
 2 years ago
Best ResponseYou've already chosen the best response.1Yeah. I figured angles B and DAB must be equal, angles CDA and CAD must be equal, and angles B and C must be equal

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.1you are almost there  now assign a symbol to angle ABD  lets call it x, and fillin all the other angles you know using this symbol, e.g. from what you have already said we get: dw:1351641960334:dw now find y in terms of x and then use the property of the sum of the angles in a triangle to solve for x.

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.1have you understood how to proceed?

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.1HINT: Use the angle sum of a triangle in triangle CAD to express y in terms of x.

Copythat
 2 years ago
Best ResponseYou've already chosen the best response.1Using triangle CAD, y = (180x)/2?

Copythat
 2 years ago
Best ResponseYou've already chosen the best response.1I plugged that in for y: 180=3x+[(180x)/2] And found x=36

asnaseer
 2 years ago
Best ResponseYou've already chosen the best response.1And your answer agrees with the one I got as well :)
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