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first box=(1)^2

second box =(c+1)^2

Step-by-step explanation:

Explanation:

We have c^2 + 2c, where 2 is the coefficient of the c term

This halves to 2/2 = 1, and then we square that to get 1^2 = 1.

Adding 1 to c^2+2c will result in c^2+2c+1, allowing it to be factored. This is because it's a perfect square

The rule we use is

(a+b)^2 = a^2 + 2ab + b^2

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)