# The angles

The angles in the triangle are in the ratio 12: 15: 9. Find the angles.

Result

A =  60 °
B =  75 °
C =  45 °

#### Solution:

$A+B+C=180^\circ \ \\ \ \\ d=\dfrac{ 180 }{ 12+15+9 }=5 \ ^\circ \ \\ \ \\ A=d \cdot \ 12=5 \cdot \ 12=60=60 ^\circ$
$B=15 \cdot \ d=15 \cdot \ 5=75=75 ^\circ$
$C=9 \cdot \ d=9 \cdot \ 5=45=45 ^\circ$

Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
Be the first to comment!

Tips to related online calculators
Need help calculate sum, simplify or multiply fractions? Try our fraction calculator.
Check out our ratio calculator.
See also our trigonometric triangle calculator.

## Next similar math problems:

1. Ratio of sides
Calculate the area of a circle that has the same circumference as the circumference of the rectangle inscribed with a circle with a radius of r 9 cm so that its sides are in ratio 2 to 7.
2. The trapezium
The trapezium is formed by cutting the top of the right-angled isosceles triangle. The base of the trapezium is 10 cm and the top is 5 cm. Find the area of trapezium.
3. 30-gon
At a regular 30-gon the radius of the inscribed circle is 15cm. Find the "a" side size, circle radius "R", circumference, and content area.
4. Quadrilateral 2
Show that the quadrilateral with vertices P1(0,1), P2(4,2) P3(3,6) P4(-5,4) has two right triangles.
5. Circular segment
Calculate the area S of the circular segment and the length of the circular arc l. The height of the circular segment is 2 cm and the angle α = 60°. Help formula: S = 1/2 r2. (Β-sinβ)
6. Circular pool
The base of the pool is a circle with a radius r = 10 m, excluding a circular segment that determines the chord length 10 meters. The pool depth is h = 2m. How many hectoliters of water can fit into the pool?
7. Decagon
Calculate the area and circumference of the regular decagon when its radius of a circle circumscribing is R = 1m
8. Nonagon
Calculate the area and perimeter of a regular nonagon if its radius of inscribed circle is r = 10cm
9. Annular area
The square with side a = 1 is inscribed and circumscribed by circles. Find the annular area.
10. Quarter circle
What is the radius of a circle inscribed in the quarter circle with a radius of 100 cm?
11. Waste
How many percents are waste from a circular plate with a radius of 1 m from which we cut a square with the highest area?
12. Circular ring
Square with area 16 centimeters square are inscribed circle k1 and described circle k2. Calculate the area of circular ring, which circles k1, k2 form.
13. Flakes
A circle was described on the square, and a semicircle above each side of the square was described. This created 4 "flakes". Which is bigger: the content of the central square or the content of four chips?
14. Company logo
The company logo consists of a blue circle with a radius of 4 cm, which is an inscribed white square. What is the area of the blue part of the logo?
15. Area of a rectangle
Calculate the area of a rectangle with a diagonal of u = 12.5cm and a width of b = 3.5cm. Use the Pythagorean theorem.
16. Billboard
Rectangular billboard is 2.5 m long with a diagonal 2.8 m long. Calculate the perimeter and the content area of the billboard.
17. Square
Calculate the perimeter and the area of square with a diagonal length 30 cm.