Question

How do I prove that DC is perpendicular to EF?

Also how do I do number 8 (I don’t think I did it right)?

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

let the point where DC&EF intersect be G

in triangle AEF

angle A +angle E + angle F = 180°

60 + 60 +angle F =180

angleF = 60°

in triangle BCD

angle B + angle C + angle D = 180°

90+30+angleD = 180

angle D = 30°

in triangle DFG

angle D + angle F + angle G = 180°

30+60+ angle G = 180°

angle G = 90°

so, DC is perpendicular to EF...