The figure below shows a rectangle ABCD having diagonals AC and DB.

 b) ΔADC ≡ ΔBCD by SAS

Step-by-step explanation:

Step 1: AD = BC                     SIDES are congruent

Step 2: ∠ADC ≡ ∠BCD          ANGLES are congruent

Step 3: DC = DC                    SIDES are congruent

The proof is using Side-Angle-Side (SAS)

Look at the angles in step 2.  These are the triangles you are proving congruency for: ΔADC ≡ ΔBCD

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)

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.