In right triangle ABC,
M<A = 42º. Find m<B.

The answer for the above posted problem is 48°

Step-by-step explanation:

Here we will apply angle sum property of triangle, i.e, the sum of three angles of the triangle is 180°.

Given:

ABC is right angle triangle.

Solution:

so ∠C = 90° ( from given figure)

∠A =42° (given)

∠A + ∠B + ∠C = 180°

or, 42° + ∠B + 90° = 180°

or, ∠B = 180° - (90° + 42°)

= 48°

so ∠B = 48°

Thus we can conclude that ∠B = 48°

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

happy to

pls mark as brainliest