A numerical expression is evaluated as shown. 20 + (8 x 9 + 18) ÷ 10 x 4 Step 1: 20 + (72 + 18) ÷ 10 x 4 Step 2: 20 + 90 ÷ 10 x
4 Step 3: 110 ÷ 10 x 4 Step 4: 11 x 4 In which step does the mistake first appear?
1 answer:
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<u>Answer-</u>
<em>The correct answer is</em>
<em>∠BDC and ∠AED are right angles</em>
<u>Solution-</u>
In the ΔCEA and ΔCDB,
As this common to both of the triangle.
If ∠BDC and ∠AED are right angles, then
Now as
∠BCD = ∠ACE and ∠BDC = ∠AED,
∠DBC and ∠EAC will be same. (as sum of 3 angles in a triangle is 180°)
Then, ΔCEA ≈ ΔCDB
Therefore, additional information can be used to prove ΔCEA ≈ ΔCDB is ∠BDC and ∠AED are right angles.