Triangle, circle 2

In triangle ABC angle ACB=60 degrees. Find angle AOB

• 120

• 130

• 140

• 150

• 160

Sum of the legs of a right-angled triangle is 12 cm, and hypotenuse of the triangle is 9 cm. Find the radius of a inscribed circle about this triangle.

• 2

• 4

• 2.5

• 3

• 1.5

If the area of a circle is

 $49\pi\ cm^2$  , find the circumference of the circle

•  $24\pi$  

•  $8\pi$  

•  $14\pi$  

•  $18\pi$  

•  $12\pi$  

In triangle ABC, angle B=90 degrees, BH is perpendicular to AC, AH=3, HC=12. Find BH.

• 4

• 6

• 8

• 10

• 7.5

In triangle ABC, CK is bisectrix, AC=8, BC=6, AK=4. Find BK.

• 2

• 3

• 4

• 5

• 6

In right-angled triangle, one of the legs is 3 times greater than the other and hypotenuse of the triangle is  $\sqrt{10}$  cm. Find greatest leg.

• 1

• 2

• 3

• 6

• 5

One of the sides of an isosceles triangle is 10 cm, and perimeter is 40 cm. Find other sides of the triangle.

• 18 and 12

• 14 and 16

• 10 and 20, or 15 and 15

• 15 and 15

• 13 and 17

If two sides of a triangle are 6 and 8, what is the least possible value for the third side?

• 2

• 3

• 4

• 5

• 7

AM=9 cm, BM=12 cm, CM=8 cm. DM-? cm.

• 11.5

• 12

• 13.5

• 8

• 6

According to find the angle x between two secant lines

• 25

• 55

• 40

• 50

• 60