View source for Altitudes and orthocenter of a triangle

===Name of the activity===
Brief blurb describing what the activity.  If this has been borrowed from some external web site (for example, a non OER or OER site which had this idea and based on which the activity was developed)

=== Objectives ===
Content objectives  - what content areas

Skill objectives - what specific skills

Classroom objectives - to demo peer learning, to make a classroom resource, etc - 

All these kinds of objectives need not be there for every activity.  And no need to list them as different headings.  This is only for our reference when we are developing activities.

===Estimated Time===

=== Prerequisites/Instructions, prior preparations, if any ===

===Materials/ Resources needed===
===Process (How to do the activity)===
How to do the different steps of the activity?

What kinds of questions you can ask for that activity

What are the student follow-up activities/ questions you can give?

Categories:  (Subject) (Topic) (Sub-concept/topic) (Class 6) (Resource format)

Example -  (Mathematics) (Triangle) (Area) (Perimeter) (Class 6) (Class 8) (Geogebra) (Video)