# Real numbers + cosine - math problems

#### Number of problems found: 7

• Cotangent
If the angle α is acute, and cotan α = 1/3. Determine the value of sin α, cos α, tg α.
• Trigonometric functions
In the right triangle is: ? Find the value of s and c: ? ?
• Regular 5-gon
Calculate the area of the regular pentagon with side 7 cm.
• IS triangle
Calculate interior angles of the isosceles triangle with base 40 cm and legs 22 cm long.
• 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?
• Cuboid
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°
• Forces
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.

We apologize, but in this category are not a lot of examples.
Do you have an interesting mathematical word problem that you can't solve it? Submit a math problem, and we can try to solve it.

We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...

Real numbers - math problems. Cosine - math problems.