Tellyy8104
17.01.2020 •
Mathematics
Plz solve
an isosceles triangle has a verticle angle of 108 degree and a base 20cm long calculate its altitude
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Ответ:
Work out the altitude (a):-
the altitude forms a right angled triangle with vertex angle = 1/2*108 = 54
so tan 54 = 10 / a
a = 10 / tan 54 = 7.265
area of the triangle = 10 * 7.265 = 72.65 cm^2
Ответ:
Shania is correct.
Step-by-step explanation:
For a right angled triangle, given two sides and an angle, we can use the sine rule or the various trigonometry identities to solve the triangle;
a/sin A = b/sinB
and
sin (angle) = opposite side/hypotenuse
cos (angle) = adjacent side/hypotenuse
tan (angle) = opposite/ adjacent
assuming a is the opposite side of angle A and b is also opposite of angle B
Otherwise, the only way to solve a triangle given two sides only is by the use of the Pythagoras theorem.
Hence, Shania is correct.