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These resources are designed to help you familiarize yourself with the exam format, identify key topics, and practice effectively. Whether you're preparing for the May/June or GCE sessions, our curated materials provide both objective and theory questions to enhance your study sessions.","tags","waec nigeria west africa examination council","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",18,"createdOn",1755991949910,"updatedOn","questionsCount",27220,"courseCount",23,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"9JjtgPHbXwEvQQvKqDkn80FTVrgGdI","q","The interior angles of a pentagon are (2x + 5)o, (x + 20)o, xo, (3x - 20)o and (x + 15)o. Find the value of x","ans",[414],2,"2009","course","mathematics","exp","(2x + 5)o + (xo + 20o) + x + (3x - 20)o + (x + 15)o = (n - 2) x 180
\n
\n8n + 20 = (5 - 2) x 180
\n
\nwhere n = 5(Pentagon)
\n
\n8n + 20 = 3 x 180
\n
\n8n + 20 = 540
\n
\n8n = 540 - 20
\n
\n8n = 520
\n
\nx = 65o","opts",[422,423,424,425],"80^o","70^o","65^o","40^o",12,"12","initComment","initReply","actionData","errors"]

WAEC - Mathematics (2009 - No. 12)

Explanation

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