Cosine + real numbers - problems
- Trigonometric functions
In right triangle is: ? Determine the value of s and c: ? ?
- Regular 5-gon
Calculate area of the regular pentagon with side 7 cm.
In point O acts three orthogonal forces: F1 = 20 N, F2 = 7 N and F3 = 19 N. Determine the resultant of F and the angles between F and forces F1, F2 and F3.
- IS triangle
Calculate interior angles of the isosceles triangle with base 38 cm and legs 26 cm long.
Determine the dimensions of cuboid a, b, c; if diagonal d=9 dm has angle with edge a α=55° and has angle with edge b β=58°
- Triangle TBC
TBC is isosceles triangle with base TB with base angle 63° and legs length |TC| = |BC| = 25. How long is the base TB?
If the angle α is acute, and cotg α = 1/3. Determine the value of sin α, cos α, tg α.