4. In Fig., ZAOB = 90° and ZABC = 30°, then ZCAO is equal to: 30° a) 300 b) 900 c) 450 d) 600

In figure, if angleAOB=90^(@) and angleABC=30^(@)," then" angleCAO is equal to

In figure, if angleAOB=90^(@) and angleABC=30^(@)," then" angleCAO is equal to

If in any triangle ABC,C=90^(@),A=30^(@),c=20 then a is equal to.

In a triangle A B C , if B=30^0a n d\ c=sqrt(3)\ b , then A can be equal to (a) 45^0 (b) 60^0 (c) 90^0 (d) 120^0

In a triangle A B C , if B=30^0a n d\ c=sqrt(3)\ b , then A can be equal to 45^0 (b) 60^0 (c) 90^0 (d) 120^0

If two acute angles of a right triangle are equal, then each acute is equal to (a) 30^0 (b) 45^0 (c) 60^0 (d) 90^0

If all the three angles of a triangle are equal, then each one of them is equal to: (a) 90^0 (b) 45^0 (c) 60^0 (d) 30^0

If a + b =8, a -b =4, then a^2 + b^2 is equal to (A) 20 (B) 40 (C ) 10 (D) 30

PQ is a tangent to a circle with centre O at the point P. If OPQ is an isosceles triangle, then /_OQP is equal to 30o (b) 45o(c)600 (d) 90o

In Fig.95, If A B ,\ C D\ a n d\ E F are straight lines, then x= (a) 5 (b) 10 (c) 20 (d) 30