Understanding the Text A ht Answer these questions. 1. Why did Jo toss up a snowball? 2. Why did Laurie invite lo to his house? 3. What gifts did Jo bring for Laurie? Which one did he like the most? 4. How did Laurie know all the March sisters? 5. Why did Laurie's grandfather not allow him to visit their neighbours 6. Why did Laurie leave Jo alone in the library? Did she mind? Why! B Choose the correct answers to complete these sentences. 1. Jo wanted to ask her mother
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Answer:
Angles ACD and DCB are a linear pair. Sum of these angles = 180 deg
ACD + DCB = 180 deg
CE is bisector of angle ACD.
CF is bisector of angle DCB.
To prove that angle ECF = 90 deg.
ECF = ECD + DCF = 1/2 ACD + 1/2 DCB
= 1/2 { angle ACD + angle DCB ] = 1/2 180 deg = 90 deg
Explanation:
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